Acrel DC energy meter has dual DC input and is mainly designed for applications such as telecom base stations, DC charging piles, and solar photovoltaics. This series of energy meters can measure voltage, current, power, and forward and reverse electric energy in DC systems. In the actual use site, it can measure the total electric energy and the electric energy within a specified time period. The detection results can be used for local display, and can be connected with industrial control equipment and computers to form a measurement and control system. It has forward and reverse active electric energy measurement function, and can complete voltage, current and power measurement. DC Energy meter has the functions of calendar, timing and leap year automatic conversion, and has the function of correcting time. There are two sets of rate periods, and the automatic conversion of the two sets of rate periods can be realized through the preset time. At least two time zones can be set for each set of rate periods throughout the year.